Microstructure and stress corrosion resistance of alloys X750, 718, and A286 in light water reactor environments
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The results of microstructural characterization and stress corrosion cracking tests are presented for several heat treatment conditions of the age-hardenable Alloys X750, 718, and A286. Resistance to intergranular stress corrosion cracking (IGSCC) was evaluated using slow strain rate tests in pressurized water reactor (PWR) primary water, microstructural etch, and rising-load screening tests. The results of these tests indicate greater IGSCC resistance in the PWR primary water environment for X750 microstructures with heavier grain boundary coverage by Cr23C6, regardless of grain boundary chromium depletion. Alloys 718 and A 286 were not highly SCC susceptible according to these screening tests, although they are not immune to IGSCC in reactor environments. Results are compared with those of a related program, including crack initiation and crack growth tests in pressurized and boiling water reactor (BWR) environments.
KeywordsSlow Strain Rate Pressurize Water Reactor Slow Strain Rate Test Boiling Water Reactor Domian
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